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use in the laboratories. >> at the dea's special testing and research laboratory in virginia, heroin and other drugs from around the world are tested to determine their unique signature, what they're made of, and where they came from. >> these are drug samples that have come to the laboratory for analysis. this is a large amount of south american heroin present in this bag actually from colombia. its purity is about 90%. >> 90% pure. >> 90%. >> is that where the danger of overdose comes from when you've got something that pure? >> yeah. if this product were to hit the streets and a heroin user accustomed to using a less pure product took a large amount of this they could in fact overdose. you can see it's fine white powder in its appearance, a little off white in color. that's highly refined, colombian or south american high purity heroin. >> and once it does hit the street, the purest heroin in the nation becomes the deadliest. >> the devastation of this is that one time somebody makes a decision to use it whether it's the first time or their last time because of the purity of the h
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